Method and device for identifying documents
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 8, 1980
Grant Date -
N/A
app pub date -
Jun 6, 1978
filing date -
Jun 21, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and device for identifying documents. A multiplicity of machine-readable markings which characteristically modify incident light by diffraction or refraction are applied to the documents, and selected markings are then cancelled out, the remaining markings representing coded information. The markings are of at least two different kinds causing different modification of incident light, and are arranged in a characteristic configuration on the documents. Information about said configuration is stored in an identification device to permit checking of the remaining markings.
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